Thickness of large letter

I tried posting a large letter today which measured 2.3 cm thick. Label printing for royal mail says a large letter is 2.5 cm thick. This is not the case as it wouldnt fit through the post office measurements thing. It was 3 milameters to big. So I'm having to post my item as a small parcel. Has anyone else had this problem?
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I have the Royal Mail measurements in front  of me and the size for a large letter is 25mm  thickness,  353 x 250mm and max weight 750g.

 

My postmaster assures me that they are allowed to 'gently' pull the items through the cut out slot guides,  however,  the slightest resistance , then they have top charge for the next size,  and that would indeed be,  the small parcel size.

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